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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6836d136e33d7c7c89bf48a594c6554d1a8ac4ee48272a41d28ece61123880c' 
  AND token = 'oa3gbP7gB2YS17IN+zpOxcw1g+GRC2OykbOC9TVHAF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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