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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b835fac5bbf33ae766e28e264a57e7469e79be81e24b2a824d081dc3bfdad05b' 
  AND token = 'HUL2mi2zbyuWd6LPcnlnc6q7e/YXzK1+up1VRi3EUm0=' 
  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"
    }
  }
}