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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '997898410aa2afdf5c9c7b744fc73d125330f3da9dc431013fac421b165ac8fc' 
  AND token = '3Scz9ajjPQncm0aC2y7bSAE28QV9Y6eWIoeTN9WlTlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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