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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c941c04f74979b54c39de3a5cbbf20301b2cfa59e08f7f121a3ff8be1ef59fd7' 
  AND token = 'PXTT8JhXeQhPgJCqMTBUpmy2Fn1BX93TLHp9o5rTp1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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