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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bdcf26efa85365159585ba8d3dad33993c0ab113464f6661ced41ab13ceaa0c' 
  AND token = 'V8aHnh7rN+N7wuKXWaxYZD2GWUEYxo0f6ZXbxRrX7Jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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