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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaac6165f1b0474a274415efea46c3cfe7b7d235b5ea1d6549af240b85515f1f' 
  AND token = 'sMaGNUj7Ki1hTo+V6EjEMsL6Ry16QGkGsn7A1MZSwZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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