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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '065e66d2a58f12297780c0d9e62914eb0248ff4c378ed414e23e1b1932f8d628' 
  AND token = '8DFgamrYjxLuIv7Pppq6yhcELSRwmto/gpbyF2elPrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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