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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bdfe956ea8b64fe393f67d57174b1c6131546b8a932768dca5a3d9d32758bb7' 
  AND token = 'OSLG6BjTfCxhe3faZl+ZM7Vjp8ZtWbuf9BlnzkJ72tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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