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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83b2bd26909fec3ef1b4d630539ba9e6bd9607a76744a511d4482eed2a16bf12' 
  AND token = 'OFjdWdclqcqSBLXyt/uh5ZOe7KO4aC5dxtJ7DzU7LcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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