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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9abcf126ad138f9de992627b8ea706e7af84b63070b1227eb12ea83ae9088d75' 
  AND token = '2EiS0Saatk4Vtr0I4elH2Zn1Kg2x48pDLsaPj3eWcEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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