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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '326dc37bb6c9dbbd8e0acb5efb45fae6e66d5c21bd3aa3d22693a5a4412fc94c' 
  AND token = 'lpFLwBDOnYTMW2s7pBtJevwZqNYgbFW/WNAn6bCaNwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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