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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c763d43bcf511b833516b8037cc0cf6bc8780405b7b5495a6ac64d04ca69d13' 
  AND token = 'l8kkfqTyhCq5yNpLAj3nwmC2ppJhYtinbYxHQAi4Vok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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