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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5b3c43b208077d0210b8714ea2b1c5ef316a97d12f84e8ffc023140ffce6704' 
  AND token = 'Hz46TRSulAEie+ka2N0acfC6/0miELBtm/8tfEKomfY=' 
  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"
    }
  }
}