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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd141c8ac88894f0a02601ba38bbb6e82002ded48cb63b5c5b0be2b5c4177e678' 
  AND token = 'Mch0Q+mN77xRggSfzE9Iit1A4Tc47KF/s7iT4RDWMkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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