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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd36e8ac0411594cb4958aed34203c228a4fdcee671a71bda824a773f220673d6' 
  AND token = '+Onm2c7tNgCQkPcocM/7fJiJY4f1tTEmF/MRdgs2f0E=' 
  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"
    }
  }
}