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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43b2e1f7e190499208b5560ae2b997bea6384c7f8c6b5179271700ed88c9a0b7' 
  AND token = 'bqCvthGD1YK6fMHQmrYKORpp1IpBTMbHmYQRCOVRrHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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