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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5e673e9e168e94296346680e023937f0a6bf81b21d60019edbb59e6673aa88d' 
  AND token = 'xvTYCUCL5nEHXeeqJoVWmJu0lGMGoGs9vteAr7AqtqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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