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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd2490ccf1de337fbf756616920fe302209619a15843c08fac1ae4154c1cc778' 
  AND token = '1IMrWzUmBDd+MjOFQFGFhf9f/1+LfGGZ4/ovulv3sT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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