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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd123192ea87195ab67766ab9461bc98c23ed8fc9d06b1ded396fe3b25da3728d' 
  AND token = 'u3EgQGpw66Fkq4X56FKhlQx1rsXs/zQ0QT1hsOFNnW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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