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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aee3834f435d7534281922daad0f2265b2092a281107211a9c20ad5e53d44f07' 
  AND token = 'Q82xj8soZazk1jhJj5mdLfGrLiTrH1vBfRbtq1VLarA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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