Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c094b197a6c18dcf76b259d24503d40fc9e91e86ea93dfe975f3b0c24d49958' 
  AND token = 'nSa+A+RsYQTMLB5E2jvqkrKMoQ3E4m/90YiDMMKxFbs=' 
  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"
    }
  }
}