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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1aa93901d1f96fd9e89ac91971afaf300b1c8b2cb048c56a138e27200faa6de' 
  AND token = 'T2U4cGzf4TYx+SaCealZF1gZwnydnHYytyOkGXnL4is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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