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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c14e8df063400f7728f8c53e0775b929e676712a07ea28fd83afbe5dc6f92139' 
  AND token = 'JGYf4jKgnjqxbnyKp32Obmcm1IZT+EdzcvbWf0cTKdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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