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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11998f3b6a612ec0c604d32668847e2e05e633a85bd906186a89b4fa8eefcaa1' 
  AND token = 'yrhSyd0+vhMojV6LFlknXyadwaZH3d3v39+XkyfwZvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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