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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1177f827b4f35026c6561b64917626205d72e807fca4cc64b40be76796e11d39' 
  AND token = '+HsCWvltyt7meqDO+LS+H9rwWfk3hOpsWIHPQD3Xk7w=' 
  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"
    }
  }
}