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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d704b0bc0fe44f9b733ba1bdc71d5289ef9bf2c8b180bf1b7de170ebb21f7b9' 
  AND token = 'iVrZht4y+LGeO7LMnBzhcQ/sX/E2nLNVJ0HYQtY2qM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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