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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef1931725fff400db5de0edffa4f1afe7cbe803ad1a6a8d5ec4d53c7356b51d8' 
  AND token = 'PMAoQfXMBCYgdP55JZKHzdado35OHkf+uU+nZgvBqB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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