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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a2721391c1cf25d91f16fc68b1838d7bdabc1a60e64dbf26cca6ecff4f9d6f2' 
  AND token = '9Dl8Kbw+73j31JXSS1soyPSuYKbjLeF3sjpiZqHX/p4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}