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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9427b4371c5d973cc7a5c703cd0a716b959125919136f65ad3d727c122995f50' 
  AND token = 'jMucaeXH7eADw0W2oLN4HMgZPJqxqcWWo0QnlME4XxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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