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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ff9d2f2fa26c15e2a5853126cc5813f40cc7c926dc39b6d7a8076d37bd0e378' 
  AND token = 'H+20sA0vJw7l0RcxpkO4+KaS2o6ZIMPlPwU/1F3yy2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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