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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cee6e2026889f9d71665bacb7d8027318f6683a0cd09ef6bf57aea260671d9c' 
  AND token = 'bDLRgJ7hlaM0HT0H+DVHJL84Qe10Fkmom+xiW4aNMHU=' 
  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"
    }
  }
}