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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cef79f79611ac555d370417e3e5722c312a7337b7e7b9f4b081ef498097108fb' 
  AND token = '7Stw+tml4yA/PrOp02SIntFXFwm4u8H29uG06Ba1Jyk=' 
  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"
    }
  }
}