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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '752cd8d7a0be581e52b43302cd156cbacb5e472aa6a737c3cf0d5a010a2eb461' 
  AND token = 'jUa0SO4N6s1PP09unpY3qdLb8OEmNYwS8hzxw7TfmRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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