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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfee66f0acb5c39115b4761b41eb19a6bf3ff43f44c299c87ea977914711cbc8' 
  AND token = 'nyZHpV7SkH8wWXygPaYfpG9TO3zsfBGNI2gg4M9p5Vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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