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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '953526cfb891998b6348bede660d70c7be3d2ae8c85883ec94cc981db0c7f6f9' 
  AND token = 'BUrTcAypzImVwbRScU1eaDN/0oemZgOb+IQKzcfgn5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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