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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2fcf3095e9a74ac2c4bc3d77fbd35381c8b3a47dc57ccf1e9447524fc2cc123' 
  AND token = 'EcYs3fMEipZiKkcphdabvLtWTV4L2vSkONistyHcaLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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