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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c613e28c17c83127966e3fdb41f417df1b8038eea34077dbe031227fd822f82' 
  AND token = 'MFGM98dCB7eGjf6ES2u880I79ZAUyh7xVSgr19aFA5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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