Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c62ddbc6a6bd75cbed73044fbfd34097a0f0dd0e141dae7ac109a56c657cbd58' 
  AND token = 'ZxNw4JN8ydAdF+6AAtHhX0yQlDPBog58Pcc4KG+iIhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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