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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eb85935c26d7f9733bde3cf2cf0ff57e778ac229835d8ee2c6aa8dc6d3893fc' 
  AND token = '9NKapZw/gw3jlNg6YDj2rtDoP6m9vsB2W4At4dmTgNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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