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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe2412d9190390ac05f72c2c5078cb8c0e5032965c93716580aea64efb52fd02' 
  AND token = 'PD0QckHdZtmwntequMTWUEoiVZeDFqqh2G8GjP/XBHs=' 
  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"
    }
  }
}