Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad885fcaf6da4a7b12d66a7b4111e9e69707ae9103fc5fe06f1976384f3a91ff' 
  AND token = 'A4eEdm71GLjvNaK6h3abbBaEVBRXtAY/VSmnOMNp51g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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