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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd177972c77ae8195e999fb7bb943f1df7c5a10b7f59c1519f52995748a3659b3' 
  AND token = 'KFTF98xIfj8jnnFPw74IEpzFP36p0wcJ4oNia/HpGs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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