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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3216f19275fb91e3776c54de558e1cfacdb702d8819c29a00084a5e0cf9122b7' 
  AND token = 'kpZuqSkpRSG0NhPQh7Mg3aeyackcphCRIIaffIdprb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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