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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07a9a716d4a866b09c0670cb8f2ee48df7f84c792c01b42e57905e9d38316ab5' 
  AND token = 'OJNq/iKT5ZOVUy5DiVkKgZ+OZ2ZWzV4g6oScvtN8Tq8=' 
  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"
    }
  }
}