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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53127e795024df11670729a84d9584f301ce59e81348e9d9463543e76d115285' 
  AND token = 'D65qnQ4EC90w45w6yrwXQ4zClTQuFpj71hyFjf/Vo8Q=' 
  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"
    }
  }
}