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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '592267dda5eb81c21bc5b1725f03c1808f7ba73280a75b5dd8d6a0a692cb36e2' 
  AND token = 'YSHsNNC4IaQWjIYH8an9/I1L8jDuBbkCHUV5ml0TRYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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