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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ae60031dbb0032c6db4c915921d15c942a0ff252a0c695bc7c481a86ab5b94a' 
  AND token = 'hfvacrkPS/4gY6Da3XLW4q73/l9GyIFQnbJqXLPizRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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