Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78a139dbf7020dd1e1e52cb8f48cda7b796f380430875c32be8b24d53e0a33f6' 
  AND token = 'qLH2maiK2A/SShAs15ugOm2KpJqMOUqZ73NGyrW9wC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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