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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1a8be5fe0e7a94f28a01567f1f37f944cd7953abae81d7a873343f0f3fc50c9' 
  AND token = 'mFWzB9W00vrIrboUy7DZBYkW4gvP0GiyJUNzKnOrkls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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