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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4bb23ba0af045d8bac0c43d66733dbbe54f6198728ac359cf096da106ea7383' 
  AND token = 'sJVO+u41/Glk7J/qLHD5LgZSKyl55s107T9E5Z1SLVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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