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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a4192cdf144cc61d69cc4886c9798a7b337bbdee62967122c6d7d20c6cbd70f' 
  AND token = '2wQ1IAhR0sf27edH6wop1tYipfLVDgMCuLYqMJjtkjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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