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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd033467f8da358be2c90e1773dd3bc6a4b76eb4952fbac566df44a24dbeccd40' 
  AND token = 'uaOG2Z1sB4RtNF85MINiK3KaJgdqtBaujq/VUCP0t9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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