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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '833dfcc099221b7efd0e38aed2c9ca880cc4aef1864073f4453c04b7d1964106' 
  AND token = '9JpUWmzEUA4Fx+7buWOu5ZUt1l/vL0acxVBIbJbkvZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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