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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfe0c058e33c1a11a69cd9634a8f4958862ac67859bee078cb5b96de8447f597' 
  AND token = '5gkg1f5GXiQIRzIRbyb81i0zJ6C7H14qocEwVlcxXno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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