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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c6d686c73b6ad0f7428bf0c6e0fe74d065f79d8de2fc653a13879730004aa0f' 
  AND token = '5Ro0DyHL790UIlatJtF+zlS3M4Oo1IcyZrarsTxZUpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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